Fek me SARBloke. How many OCUs (not basic trg / phase 2 trg etc) last longer than 6 months? And if they do, again, a letter through the chain of command will place a marker that will over ride the 6 month limit. Hell, I got a 3 year extension on what used to be known as a Home Owners Certificate because I was posted to London and couldn't buy a house of equal size to that I was selling in Norfolk. One letter, about 15 mins of my time. Not difficult.
Note to self. Don't offer advice. For some there glass is always half empty